the taliban is clearly trying to split us apart. but it won't work. >> reporter: military officials say that sometimes these insider attacks are carried out by members of the taliban who have infiltrated the afghan army and sometimes they are caused by arguments but usually the attacker is killed in the fire fight that follows. shannon? >> shannon: peter doocy thank you very much. >>> the premise of these conversations, the premise of your tax reform point is as if the economic pie is fixed and it is government's job to redistribute. that is not how the world works. we want to grow the pie and we want economic opportunity. >> shannon: three days away from the first presidential debate and less than six days away from the election. gop vice presidential candidate paul ryan expressed concern for the economy and stronger foreign policy in countries like iran and russia and opened up about how his own debate is shaping up against vice president biden. i was sitting down this morning with chris wallace to get all of the details ahead of